Riffle for concentrating-tables.



A. M. KEMP, M. W. LOOMIS &'J. E. PITZWATER.

RIFFLE FOB. OONGENTRATING TABLES.

APPLICATION FILED FEBJS, 1909.

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Patented July 5, 19,10. l

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UNITED sTATEs PATENT oEEioE.

ALBERT M. KEMP AND MER'ION W. LOOMIS, OF DENVER, COLORADO, AND JOSEPH E.

FITZWATER, OF ROSSVILLE, ILLINOIS.

RIFFLE FOR CONGENTRATING-TABLES.

Specification of Letters Patent.

Application led February 13, 1909.

Patented July 5, 1910.

Serial No. 477,733.

To all whom it may concern:

Be it known that we, (l) ALBERT M. KEMP, (2) MERTON W. LooMis, and (3) JOSEPH E. FITZWATER, citizens of the United States, residing at (1 2) Denver, in the county of Denver and State of Colorado, and (3) Rossville, Vermilion county, Illinois, have invented certain new and useful Improvements in Riiiies for Concentrating-l Tables, of which the following is a specification.

Our invention relates to tables for oreconcentrators, and more particularly to the form and arrangement of the riffles of such tables, and has for its object to provide a more eilicient surface for separating the gangue and concentrates. We attainthis object by the construction shown in the aecompanying drawing, in which z- Figure 1 is a plan view of the top of a concentrator table built in accordance with our invention and Fig. 2 is a perspective of one of the rifHe-bars, shown detached from the table.

1 is the pulp-box, located at the head of the table, l the discharge end for the concentrates and 7 the side at which the gangue is discharged.

The rifles 5--6, are arranged substantially parallel to each other and to the sides of the table; each rifile comprising a series of sections 8, 8, gradually decreasing in depth from the head of the table to a diagonal line 2, 3, and having their ends slightly overlapping laterally, as shown in the drawings. By this construction, shoulders, having their faces normal to the longitudinal ritfles, are formed by the overlapping ends of the sections, which shoulders assist materially in propelling the material toward the concentrates discharge end of the table. From the head of the table to the diagonal line 2, 3, these sections are preferably composed of wood. Between this line and the foot of the table, the sections are preferably of metal of sli ht and uniform thickness, such as strips o hoop-iron; but are still secured to the table in substantially parallel rows, and with laterally-overlapping ends, as shown at 9, 9.

Our table may be used with any desired form of driving mechanism; such, for eX- ample, as that shown in our Patent No. 900,285, dated Oct. 6, 1908; or the riflies may be attached to existing forms of tables. In

Fig.l 1, we have illustrated the means for reciproeating the table as consisting of a driving pulley 10, carrying eccentrically a crank pin 11, which is connected to a cross bar 12 of the table, by a connecting rod 13.

We are aware that continuous riiiles of gradually decreasing thickness have been used; as have also riffie-bars arranged in zigzag lines, and bars capped with a metallic strip. Our arrangement is, however, exceedingly rapid and eiiicient in operation and effects a better separation of the different grades of concentrates than other constructions with which we are familiar.

What we claim is 1. A concentrator-table having riifles oomprising contacting, laterally-overlapping sections the forward ends of which form shoulders having their faces normal to the longitudinal direction of the riflles; and means to reciprocate said table substantially as described.

2. A concentrator-table having riiiies comprising contacting, laterally-overlapping sections decreasing in thickness from the head of the table toward the foot thereof the forward ends ofsaid sections forming shoulders having their faces normal to the longitudinal direction of the rifiles, and means to reciprocate said table substantially as described.

8. A concentrator-table having a plurality of riflies extending throughout its length, said riiiles comprising contacting, laterallyoverlapping sections the forward ends of which form shoulders having their faces normal to the longitudinal direction of the riffles; and means to reciprocate said table substantially as described.

4. A concentrator-table having a plurality of riflies extending throughout its length, said riffles comprising a series of contacting, laterally-overlapping sections decreasing in thickness from the head of the table toward the foot thereof the forward ends of said sections forming shoulders having their faces normal to the longitudinal direction of the rifiles; and means to reciprocate said table substantially as described.

5. A ri'Hie for concentrator-tables comprising laterally-overlapping sections; some of said sections decreasing uniformly in thickness and others thereof being of substantially uniform thickness the forward ends of said sections forming shoulders having their vfaces normal to the longitudinaldirectino'fftheriiles; and means to reciprocate fsaid table substantially as described.

6. AA riie for concentrator-tables cornprising a series of laterallyiov'erlapping, Y, vertically-tapering sections and a series of laterally-overlapping metallic sections of uniform thickness the forward ends of said sections forming shoulders having their Vfacesnormal to the longitudinal direction of theriiiles; andmean's to reciprocate said table substantially as described.

7QA concentrator-table providedwith a ,parallel series of riiles extending throughout its length, each of said rifHes comprising laterally-overlapping sections decreasing in thicknessv from the head of the table toward the foot thereof and laterally-overlapping sectionsn of substantially uniformA thickness;

the Vnumber of said last named sections decreasing from one side of the table toward the other side thereof; and means to reciprocate said table substantially as described. In testimony whereof We have affixed our signatures, in presence of Witnesses.

ALBERT M. KEMP. MERToN W. LooMIs. JOSEPH E. EITZWATER.

Witnesses:

JOHN H.V GABRIEL, LENA E. HANNEN, J. E. SWIFT, G. A. RAY. 

